murphy



No. 608,703. I Patented Aug. 9, I898.-

W. MURPHY.

STONE SAWING MACHINE;

{Appl'mition filed Feb, 27, 1896.)

(No Model.) Q m 4 Sh eets Sheet I.

N a N WITNESSES: v

INVENTOR Wan 4 O i I i Q W ATTORNEY m: Mamas vm zqs coy. PHOTO-HTML, WASHINGTON. n c.

'No. 608,703. Patented Aug. 9, I898.

. W. MURPHY.

STONE SAWING MACHINE.

(Application filed Feb. 27. 1896.)

ATTORNEY rm-1: Moms mans co. PHOTGUTHQ, wAsHnwrom u. c

no; aosgos. Patented Aug. 9, I898.

w. MURPHY.

STONE SAWING MACHINE.

(Application filed Feb. 27, 1896.) {No Model.) 4 Sheets- Shenf ATTORNEY v m: norms Pmns ca. PHUfmuma, WASNINGTOM n. c.

No. 608,703. I Patented Aug. 9, I898.

w. MURPHY.

STONE-SAWJNG MACHINE,

(Appliation filed Feb. 27 1896.)

4 SheetsSheet 4.

ivrrisn 'rnerns A'IFN'I errors,

WVILLIAM MURPHY, OF NEW YORK, N. Y.

STONE-SAWING MACHINE."

SPECIFICATION forming part of Letters Patent No. 608,703, dated August 9, 1898. Application filed February 27, 1896. Serial No. 581,051. (No model.)

To all whom it may concern:

Be it known that 1, WILLI M MURPHY, of the city, county,'and State of New York, have invented certain new and useful Improvements in Machines forSawingStone, of which the following specification contains a full, clear, and exact description.

My invention relates primarily to that type of stone-sawing machines in which the cutting-blade is an endless band. In machines of this class as heretofore constructed, where the motive power to drive the endless cutting-blade is applied to more than one of the band-wheels or drums around which the blade passes,the motion imparted to the first powerdrum is communicated from said first powerdrum or from its shaft to, the other powerdrums by means of belt-and-pulley connection, so that all of thepower-drums are not caused to revolve positively and uniformly, the belt connection permitting of slippage, es-

pecially where pressure and speed create re-,

sistance. This method of driving the blade often results in unequal tension of the blade, and it also limits the capacity of the machine when increased speed in the blade and increased pressure of blade to stone are desired. Furthermore, the blade is often armed with diamonds, borts, or other hard substances, which are usually held in teeth inserted in the blade, and heretofore great difficulty has been experienced from the dislocation of these outting-teeth when the straight-line motion of the blade is changed to a rotary motion in passing around the drums.

My invention further relates to improvements in the form of construction and method of attachment of the cutting-teeth to the blade of a stone-sawing machine, whether to a reciprocating blade, a band-blade, or other form of blade.

All of the difficulties above enumerated are sought to be avoided in my invention, which consists in improvementsin the construction, arrangement, and combination of various parts, as hereinafter specified.

The invention consists in applying power from the engine or motor directly, by means of positive connection, to the drums or band wheels around which the endless blade passes, which said drums thus become powerdrums and are made to revolve each inde pendently of the friction of the blade thereon and each at the same rate, and thereby the blade is maintained at a greater and more uniform tension throughoutits entire length and may be utilized with advantage for cut- .tin g purposes at all points of its path between the drums, and further in the novel application of movable sprocket-pinsf0r maintaining the blade upon the drums, whereby also the motion of said drums is communicated to the blade with greater precision.

L To enablethose skilled in the art to which my invention relates to make and use stonesawing machines containing the same, I will now proceed more particularly to describe my improved machine, referring bynumbers and letters to the accompanying drawings, which make part of this specification.

I contemplate the use of two or more drums, around which the blade shall pass, each of the drums used being driven independently of the blade. In the machine exemplified in the drawings I employ only two of these drums, and in this said machine all of the improvements above referred to are embodied, although I wish it understood that any part or parts of my invention which is or are separable from the rest may be used alone with more or less advantage.

In the drawings referred to the same numbers and letters indicate corresponding parts in all figures.

Figure 1 represents a side elevation of the machine. Fig. 2 is a top view of the same. Figs. 3 and 4: are two end elevations. Figs. 5, 6, 7, S, 9, 10, and 11 show details of construction hereinafter referred to.

' 1 l is the main or stationary frame of the machine.

2 2 is the endless horizontal cutting band or blade, which may be either serrated or made with notches at intervals in its lower edge for the insertion of teeth or for carrying along sand or other abrasive material, or which may be a plain ribbon or band ,to which may be attached the cutting-teeth, as indicated in the drawings by 3 3 3 and hereinafter described. The band or blade has also at suitable and regular intervals sprocket holes or perforations 4 4-, in which engage the sprockets 5 5. I prefer to elongate these sprocket-holes, as shown in the drawings, Figs. 1 and 4, in or of these motions being controlled by shoulders or projections in the shell or at the end or ends of the shell engaging the aforesaid flange of the pin.

In the form of sprocket-pin which I have illustrated in the drawings the shell is attached to the inner side of the drum, being screwed therein, and the drum is bored to admit of the passage of the sprocket-head, as

indicated, which boring serves also as a guide or way for the sprocket-pin. The head of the sprocket-pin is made rounded to enter more readily the sprocket holes or perforations of the cutting-band, and the smaller end of the shell is angular in transverse section to admit of easy detachment of the sprocket for the examination or replacing of the spiral spring here used or for other purpose. I do not, however, confine myself to this particular form of movable or disappearing sprocket-pin nor do I deem it essential that there shall be a spring acting thereon to maintain the pin in normal position.

The cuttin g-band is passed around, carried, and driven by two horizontal drums 10 10, provided with the movable sprocket-pins 5 5 at regular intervals. Each drum has a flange 11 11 on the upper edge and the lower edge of the drum may be recessed, as shown at 12 12, Figs. 7 and 9, sufficiently to prevent contact of the diamond teeth with the surface of the drum. The drum-shaft 13 13 is mounted in suitable fixed bearings in the stationary frame, while the drum-shaft 14 14 is mounted at each extremity thereof in a sliding step or bearing, (indicated in plan and section in Figs. 5 and 6;) but all like parts of the two drums and of the drum-shafts are of like form, size, and dimensions. The said drnm-shaftshave fixed to their upper extremities bevel-wheels 15 15, in gear with corresponding wheels 16 16 17 17, mounted on the horizontal drivingshaft 18 18, which receives motion from the engine or motor through either of two belts, one straight and one crossed, and the fast and loose pulleys 19 19, or through other transmitting-gear, so that the blade may be driven in either direction, as desired. The bevel-wheel 16 16 is fixed to the said drivingshaft, which is provided with collars and a fixed bearing 20 20 at one end thereof, while the other end is fitted with a feat-her engaging a groove in the sleeved hub of the bevelwheel 17 17, collared upon a bearing 21 21, which forms part of one of the sliding steps before mentioned. This capability of horiscrews 30.

vertical section the parts referred to.

zontal adjustment of the drum-shaft 14 14 is to provide for the regulation of the tension of the endless cutting-band and admits of its repair or removal from the drums. This horizontal adjustment is effected by the following parts: 23 23 is ahand-wheel fixed to the shaft 24 24, which is provided with an endless screw or worm 25 25, engaging the gear-wheel 26 26, fixed to the vertical shaft 27 27, to the extremities of which are attached like bevelwheels 28 28, which are in gear with their corresponding wheels 29 29, fixed to the tension- These two tension-screws are mounted in the main frame of the machine and each engages its nut 31 31, fixed in the sliding head, which said heads form the two movable bearings of the drum-shaft 14 14. Thus rotation of the hand-wheel 23 23 in one direction or the other causes, through the intermediate mechanism just described, horizontal movement of the drum -shaft 14 14 toward or away from the drum-shaft 13 13 without impairing the parallelism of the said two shafts. Each drum receives rotary motion from its vertical shaft, which is splined in a sleeve to which the hub of the drum is fixed. The drum thus revolves with its shaft, while it is free to move vertically up or down, and these vertical motions it receives from the drum-carriers 32 32, one to each drum, within whose hub the aforesaid sleeve revolves, but which is engaged above and below, respectively, by the flange of the sleeve and a collar impinging on the hub of the drum itself. This common form of construction is shown in Fig. 7, which represents in The bore or bearing of the hub of the drum-carrier surrounding the sleeve of the drum-shaft 13 13 is cylindrical, while that of the other drum-carrier is elongated and of suitable form and dimension to admit of the horizontal adjustment of the drum-shaft 14 14,as described. The drum-carriers 32 32 have each four arms, in the extremities of which are fixed in each a nut engaging a vertical screw, four to each drum, and these eight screws by their rotation raise and lower the carriers 32 32, and thereby the drums 10 10 and the blade 2 2. These eight feeding-screws, as they maybe properly called, are mounted in suitable bearings and have fixed to their upper ends the bevel-wheels 33 33, which engage the like wheels 34 34, fixed to the two parallel horizontal shafts 35 35, mounted to rotate upon the main frame, and provided also with the bevel-wheels 36 36, which engage the like wheels 37 37, fixed upon the cross-shaft 38 38, mounted on the end of the main frame. All corresponding parts of this feeding mechanism being of like form, size, and dimensions, it follows that rotation of the cross-shaft 38 38 in one direction raises and its rotation in the reverse direction lowers the cutting-blade, whose horizontality is constantly preserved. The cross-shaft is provided at one end with the fast and loose pulleys 39 39, driven by two belts, one straight and one crossed, connecting with the driving mechanism or motor, by means of which gearing rapid motion may be given to the cross-shaft in either direction to quickly raise or lower the blade for purposes of adjustment. To the other end of the cross-shaft are fixed the differential pulleys 4O 40, to which motion is transmitted by a belt from the corresponding differential pulleys 41 41 on a shaft 42, to which is communicated motion from the motor by belt connection working on the fast and loose pulleys 43. The last-mentioned transmitting-gear is so proportioned primarily as to communicate the requisite feed-motion to the blade, which motion may be further regulated by the differential pulleys 40 and 41.

Figs. 10 and 11 show various forms of cutting-teeth and my improved method of attaching the same to the blade. a a a are the diamonds, borts, orother hard substances, and b b I) the rivets which secure the shank of the tooth c c c to the blade 2. The rivets are not essential to my invention. Other means of attachment, as brazing, may be employed.

There the teeth are to be applied to a bandblade, I prefer to make the attachment by riveting or otherwise fastening the tooth to the blade along a straight line substantially at right angles to the edge of the blade,whereby only the lateral edges of the teeth are brought nearer to or lifted from the blade in passing around the drums and dislocation of the teeth avoided. /Viththe same object in view the side of the shank of the tooth in contact with the blade may be made rounded or beveled (Fig. 11, g and h) on its lateral edges sufficiently to prevent contact between the shank and blade except along their line of attachment one to the other. .Between the tooth and the blade there may be inserted a thin strip of rubber or other elastic substance to prevent grit or other matter from working in between the tooth and the blade.

In applying the cutting-teeth to band-saw machines various modifications in the shape of the teeth will suggest themselves to one' skilled in the art, and I do not confine myself to the precise form of construction herein described, it being only of importance toward securin g the best results from suchmachines that no part of the tooth shall act as a lever to disturb the attachment of the tooth to the blade in passing around the drum or drums and that the attachment be made by rivets or otherwise along oneline onlyin each tooth, practically at right angles to the lower or cutting edge of the blade.

In the operation of my machine, all of the band-wheels ordrums being actuated independently of the band or blade, greater uniformityin the tension of said blade throughout all parts of its path between the drums is secured, and the stones to be eutmay be placed and operated upon at any or all parts in said path. The movable or disappearing sprocket-pins assist to hold the blade in position upon the drums, and each said pin when in normal position is free to engage in the sprocket holes or perforations of the blade; butif through unusual tension or other cause any perforation fails to be engaged by a pin in passing around the drum such pin will be forced back by the solid part of the blade, and thereby prevented from straining or rupturin g the blade. The outwardly-preyecting flange of the drums serves to prevent the blade from being forced away from its work should the sprocket-pins fail to serve their purpose.

The forms of construction and method of attachment of the teeth to the blade which have been described admit of ready exchange in the position of the teeth one for another, as occasion may require, so that the whole gang or set of teeth shall work together to the best advantage, and the capability which the machine possesses of being driven in either direction may be made to conduce to the same end.

In order to remove the blade from the machine, the drums are run down to a convenient point and the tension of the band relieved sufficiently to enable it to be disengaged from the drums. The driving-shaft is then removed and the drum shafts are raised from their lower bearings sufficiently to permit the withdrawal of the blade from the machine- I am familiar with the patent on machine for sawing stone granted to Armand Auguste February 19, 1889, No. 398,113, and with the Various improvements therein set forth and claimed, and I do not claim any of said improvements.

What I do claim as new, useful, and of my own invention isv 1. The combination in a stone-sawing ma chine with an endless perforated cuttin g-blade of two or more positively and uniformly driven band-wheels, each having in its periph-= ery disappearing sprocket-pins adapted when in normal position to engage the perforations of the blade, of outwardly-projecting flanges, secured to the upper edge of each of said positively-driven band-wheels, substantially as and for the purposes set forth.

2. The combination in a stone-sawing machine of an endless blade with a cutting-tooth attached thereto along one line only substantially at right angles to the cutting edge of said blade, having that surface of the teeth which is in contact with the side of the blade rounded, or beveled toward the lateral edges of said teeth, as and for the purposes described.

3. In a stone-sawingmachine the combination of the drums'lO, 10, whereon the endless cutting-blade 2 is driven, the shafts 13 and 14, the gears 15, 15 and 16, 17, and the shaft 18, whereby said two drums are positively driven at the same rate and impart uniform motion to said. blade, substantially as and for the purposes described.

1. The combination in a stone-sawing machine with the endless eutting-blade 2, and

the two positively-driven power-drums 10, 10 on their respective shafts 13, 14, operated synchronously by gears 15, 15 and 16, 17 and shaft 18, of the flanges 11, 11, whereby the said cutting-blade uniformly driven is held \Vitnesses:

in constant position against the stone, sub- IRVING S. OARMER, stantiaily as and for the purposes described. 1 FRANK E. PHILLIPS.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WVILLIAM MURPHY. 

